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26 June, 11:48

Baking soda (nahco3) decomposes when it is heated according to the equation below. how many kilojoules of heat are required to decompose 1.96 mol nahco3 (s)

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  1. 26 June, 14:47
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    The balanced reaction for the decomposition of baking soda is

    2 NaHCO3 (s) → Na2CO3 (s) + CO2 (g) + H2 O (g)

    We can find the heat of reaction by using the Hess' Law. This is done by using this formula:

    ∑ (Hf, products) - ∑ (Hf, reactants) = Heat of reaction

    where Hf is the heat of formation. According to literature, these are the heats of formation for each of the compounds in the reaction:

    NaHCO3: - 947.68 kJ/mol

    Na2CO3: - 1130.94 kJ/mol

    CO2: - 393.51 kJ/mol

    H2O: - 241.8 kJ/mol

    Applying Hess' Law:

    [1 (-1130.94) + 1 (-241.82) ] + 1 (-393.51) ] - [2 (-947.68) ] = 129.09 kJ

    Thus, the heat of reaction is 129.09 kJ/mol NaHCO3. Since there is 1.96 mol of NaHCO3, the total heat of reaction is 253.02 kJ.
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